Po change error

Dear All,

While I making some changes in the Purchase Order .

I am getting this error  message  :

--> "Processing state 01(Version in Process) does not allow processing of

          DocHeader  "

-->  "PO header data still faulty" 

I have checked it it is somewhat related to the version management.

I have again tried to change the PO  also tick mark the version indicator and entered the reason and when  I am trying to save the PO

still getting the same error , I am unable to save the PO .

Dear Gurus please suggest some ideas .

Regards

Deep